There is now advection fog over Huangshan City. How is this weather phenomenon formed?

1October 26th 165438+ advection fog appeared over Huangshan city. Advection fog is mainly caused by warm and humid air advection to the cushion surface, which cools the air below and forms fog. This weather phenomenon usually occurs in winter and spring, mainly in the northern coastal areas. And as long as the wind continues, the fog will last for a long time. Once the wind stops, the source of warm and humid air will be interrupted and the fog will dissipate quickly.

The advection fog phenomenon in Huangshan City is also a major characteristic landscape of Huangshan City, and the whole city is like a fairyland. Advection fog appeared in Huangshan City for several days in a row, which made morning fog diffuse among buildings and formed the scene of attic in the air. Advection fog generally lasts for a long time and has a wide range. Sometimes it can even extend to hundreds of meters.

Advection fog is very different from radiation fog. The main reason of sediment is that warm and humid air is affected by low temperature and ground temperature, which leads to the rapid cooling of the bottom air, while the upper air is far away from the ground, so the temperature drops less, so the inversion weather is formed on the ground, and then the cold air is saturated due to cooling, so it condenses and finally forms advection fog. Of course, advection also needs certain conditions, not all regions or temperatures will form the phenomenon of advection fog.

The formation of fog mainly has the following situations. First, the temperature difference between the surface and warm and humid air is relatively large. Second, the wind speed and direction must be appropriate, generally maintained at about two to seven meters per second. There are relatively many conditions for the formation of advection fog. In addition to the above two conditions, it depends on the thickness of the cold and high pressure system, the time spent at sea, and whether there is a cyclone. Therefore, we can't just look at the landscape of advection fog. Because of its geographical location, Huangshan Mountain has formed this kind of advection fog landscape.